SAN FRANCISCO , California -LRB- CNN -RRB- -- Two light rail transit cars collided Saturday in San Francisco , causing multiple injuries , but none appeared life-threatening , a rail system spokesman said .

Medical personnel treat the injured Saturday at West Portal Station , where a light rail car hit another .

`` Apparently the conductor for one of the trains miscalculated a turn . It 's still under investigation right now , '' a police officer told CNN . He would not provide his name .

At least 44 people were injured , a fire official said .

None of the injuries was extremely serious , said Leslie Dubbin , administrator for operations at San Francisco General Hospital .

`` There were no fatalities and everybody looks good . ''

The cars are part of the San Francisco Municipal Transportation Agency , commonly called Muni .

Initial reports indicated a one-car train traveling at low speed collided with a stopped one-car train , Muni spokesman Judson True said in a written statement . The accident occurred on the outbound platform of West Portal Station , he said .

As of 2:57 p.m. -LRB- 5:57 p.m. ET -RRB- , all Muni Metro light rail service that travels through West Portal Station in either direction was halted , he said . Watch scenes from the collision site ''

`` There are reportedly multiple injuries as a result of the collision , but none of the injuries have yet been described as life-threatening , '' Judson said .

Shuttle buses were providing substitute service between West Portal and Castro stations and West Portal Station and western destinations for the K/T , L and M Muni Metro lines .

There was no estimated time for the resumption of normal Muni service .

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Conductor miscalculated a turn , police officer says

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No life-threatening injuries reported , Muni spokesman says

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Collision occurred at West Portal Station , spokesman says

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Service disrupted on K/T , L and M lines